Is it farther or further?
"orifice, small opening in an animal body," 1680s, Modern Latin, from Greek stoma (genitive stomatos) "mouth," from PIE root *stom-en-, denoting various body parts and orifices (cf. Avestan staman- "mouth" (of a dog), Hittite shtamar "mouth," Middle Breton staffn "mouth, jawbone," Cornish stefenic "palate"). Surgical sense is attested from 1937.
stoma sto·ma (stō'mə)
n. pl. sto·mas or sto·ma·ta (-mə-tə)
A minute opening or pore, as in the surface of a membrane.
A mouthlike opening, such as the oral cavity of a nematode.
A surgically constructed opening, especially one made in the abdominal wall to permit the passage of waste.
Plural stomata (stō'mə-tə)